Electric insulator.



PATENTED DEC. 20, 1904.

0. BOOKBR. ELECTRIC INSULATOR.

APPLICATION FILED FEB.1, I904 NO MODEL.

UNITED STATES Patented December 20, 1904.

CHARLES BOOKER, OF TORONTO, CANADA.

ELECTRIC INSULATOFE.

SPECIFICATION forming part of Letters Patent No. 778,005, dated December 20, 1904.

Application filed February 1, 1904. Serial No. 191,546.

To all whom it may concern.-

Beit known that 1, CHARLES Booxnaof the city of Toronto, in the county of York, in the Province of Ontario, Canada, have invented certain new and useful Improvements in Electric Insulators, of which the following is a specification.

My invention relates to improvements in electric insulators particularly used for linewires; and the object of the invention is to devise'a simple, durable, and secure means for attaching the insulator to the pin; and it consists, essentially, of an insulator having a cylindrical hole provided with an internal groove intermediate of its length, a pin having a bolt extending therethrough and an annular groove formed on its exterior periphery, and a spring-ring designed to be located in such groove and spring into the groove in the cylindrical hole when the pin is fitted into the insulator, a suitable washer being provided at the head of the pin to take up the slack between the spring-rings and the grooves and the parts being arranged and constructed in detail as hereinafter more particularly explained.

Figure 1 is a sectional perspective View showing my improved insulator. Fig. 2 is a sectional perspective view of the insulator proper. Fig. 3 is a longitudinal section through the pin and bolt. Fig. 4 is a perspective View of the pin and bolt. Fig. 5 is a detail of the split or divided ring.

In the drawings like letters of reference indicate corresponding parts in each figure.

A is the insulator, which is made of glass, porcelain, or any other suitable materialand is provided with the usual exterior groove whereby the line-wire may be attached thereto in the usual manner. The insulator is of the usual hood-shape form and is provided with a cylindrical hole A, having an internal annular groove 60.

B is a pin which is preferably made of wood or any other suitable material and is made substantially the diameter of the cylindrical hole A, being, however, sufficiently loose so that it will fit it snugly and yet not tightly. The periphery of the pin B is provided with an annular groove 7/, which has a square shoulder 1/ at the outside and is of a taper or substantially wedge-shape form b toward the inner side of the groove.

O is a bolt which extends through an orifice in the center of the pin B, the head of the bolt being at the top and the bolt being designed to extend through the cross-piece which carries the insulator. A suitable nutc is provided at the bottom of the bolt, so as to secure the pin B against the cross-piece, (not shown) and thereby hold the insulator in an upright position.

D is a divided ring which is placed within the annular groove 6 in the pin B.

It will be noticed that the lower end of the cylindrical hole A has a flaring mouth (f. To fit the insulator on the pin, the springring D is sprung into the groove 5 over the pin B and a washer, of felt orother suitable flexible or yielding material, 7), is placed at the top of the cylindrical hole. The pin B, with the ring in place, is then forced into the cylindrical hole A until the groove 5 comes opposite the groove (0, when the spring-ring will spring into the groove (0, the ring being of suflicient thickness so that it will extend partially into the groove 7) and partially into the groove 6/ eircumferentially, and thereby hold the insulator proper securely in position, the washer 5 serving to take up the slack between the spring-ring D and the grooves 60 and b.

The form of the groove 6, with the square shoulder U, serves to hold the divided ring D in place as the pin B is pushed into the cylindrical hole A, and the wedge-shaped shoulder Z) serves to wedge the ring securely in position between the groove t and the groove (0 by the pin being pushed slightly outwardly by the resiliency of the washer If.

It will thus be seen that the insulator A will be securely held in place and yet will of course be permitted to turn without any danger of breaking the insulator, which is one of the defects in the common form of screw-pin and insulator now commonly used.

As the pin does not need to fit the cylindrical hole closely, the same as in the 00111111011 form above referred to, it will be readily seen that the liability of the insulator cracking or breaking is avoided.

hat I claim as my invention is- 1. An insulator comprising a hood of insulating material having a cylindrical hole provided with an annular groove intermediate of its length, a cylindrical pin fitting into the hole and provided with an annular groove designed to be brought opposite the annular groove in the wall of the cylindrical hole, a divided spring-ring designed to be sprung, so as to partially fit in each groove and a resilient washer between the head of the pin and the top of the hole as and for the purpose specified.

2. The combination with the hood of insulating material provided with a cylindrical hole and a pin fitting therein, of spring means for holding the pin Within the hole, and a resilient washer between the top of the pin and the top of the hole, so as to take up any slack in the spring connection as and for the purpose specified.

3. The combination with the insulatinghood having a cylindrical hole, of a pin fitting into the cylindrical hole and provided with an annular groove, a divided ring fitting partially into each annular groove, and the bolt extending through the pin and having the head thereof resting on the top of the pin, and a spring-washer extending between the head of the bolt and the inner end of the cylindrical recess as and for the purpose specified.

CHARLES BOOKER. \Vitnesses:

M. MoLAREN, E. B. MATTHEWS. 

